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Why Charging Your Gadgets Over 80% Is Such a Bad Idea | iFixit News
(www.ifixit.com)
This is a most excellent place for technology news and articles.
My phone has exactly this (oneplus 9 pro) but it works only when there is a full moon and the next Friday is the thirteen's day of the month, plus some other unknown requirements
I've a one plus Nord 2 5g and it has optimised charging at night but it doesn't come on every night I charge it and it does feel like there's some arcane shit needed for it to work at times.